<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I have always had extractor (header) type manifolds fitted to my Healeys since 1986. </div><div id="AppleMailSignature">My BN1, and my BJ8 - No flex pipe - all solid pipe - just like my previous Sprites. </div><div id="AppleMailSignature">The extractor exhaust on my Healey 3000 - which has been wrapped since 1995 - has just recently celebrated its 24th anniversary on the Black and White car. </div><div id="AppleMailSignature">So no flex joint pipe. Mild steel - wrapped - and I'm now on my second muffler with my side exit exhaust. </div><div id="AppleMailSignature">Ok - the first one had some repairs - but all the damage and wear was road clearance related. </div><div id="AppleMailSignature">Ignore the flex pipe. I've never had one ever in 35 years!</div><div id="AppleMailSignature">Ignore the doomsayers who will tell you your mild steel exhaust will burn up with exhaust wrap. It won't. Mine didn't. </div><div id="AppleMailSignature">My extractors are still fine. And I'm on my second muffler - and my ground clearance is probably less than yours!</div><div id="AppleMailSignature">The only enemy is ashphalt!! </div><div id="AppleMailSignature">Best</div><div id="AppleMailSignature">Chris</div><div id="AppleMailSignature"><a href="http://www.myaustinhealey.com">www.myaustinhealey.com</a> </div><div id="AppleMailSignature"><br><br></div><div><br>On 25 Oct 2019, at 12:52 am, Neil McDonald <<a href="mailto:nmcd10@gmail.com">nmcd10@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div><div dir="auto">An exciting subject indeed!</div></div><div dir="auto"><br></div><div dir="auto">I am about to fit an unused mild steel down pipe that I have had on the shelf for maybe ten years. No sign of rust but I am away from home right now so can not test it for flex. I might zap it with WD40 before fitting - can’t hurt. </div><div dir="auto"><br></div><div dir="auto">The question is - when brand new do the mild steel down pipes ever show any sign of flex?</div><div dir="auto"><br></div><div dir="auto">Neil</div><div dir="auto">BN6</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Oct 24, 2019 at 2:42 PM Perry via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="#954F72"><div class="m_-4121697948113192191WordSection1"><p class="MsoNormal">Listers</p><p class="MsoNormal">As a follow up to my post on 10/18 on this exciting subject, I decided to do an experiment with a couple downpipes I had in the parts bin. Both pipes are new old stock and have never been on a car. One is stainless and the other mild steel. Both have been laying on a shelf in the garage for at least 9 years. </p><p class="MsoNormal">The test was to measure how much deflection was noted in the flex portion of the downpipe when the tip (where it enters the muffler) is loaded with a weight. The upper portion of the pipe was firmly held by the bench vice. </p><p class="MsoNormal">Should have started with something less then 10 pounds but the stainless moved considerably under that weight. The mild steel did not budge.</p><p class="MsoNormal">At 47 pounds I heard a creaky noise but no movement on the mild steel. I then applied an unspecified force with my hand to the 47 pounds and no movement. </p><p class="MsoNormal">My conclusion is that the mild steel flex pipe, once it takes a set, ie, Gets Rusty, does not flex. It is the weak link that will fail but it might as well be a piece of regular pipe.</p><p class="MsoNormal">Perry</p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986" target="_blank">Mail</a> for Windows 10</p><p class="MsoNormal"><u></u> <u></u></p></div></div>_______________________________________________<br>
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</blockquote></div></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div>____________________<br>Neil & Pam McDonald<br><div><br></div></div></div>Email: <a href="mailto:nmcd10@gmail.com" target="_blank">nmcd10@gmail.com</a><br><div><div><br></div></div></div></div></div></div></div></div>
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